After the team fell behind by three games before the final set of the Mylan World TeamTennis Western Conference championship against the Springfield Lasers, Bob and Mike Bryan failed to mount the comeback that the Aviators desperately needed.

The Aviators’ inaugural season ended in a 22-17 loss before a stunned crowd at the Valley View Casino Center, as the Lasers (8-7) advanced to the WTT finals against the Washington Kastles on Sunday.

Before the start of the decisive fourth set, in women’s singles, the Aviators (10-5) seemed to be in good position.

They were leading 14-12 against a team they had beaten 21-15 on Sunday. Daniela Hanutchova, who had been named the WTT women’s most valuable player before the match, had won five of her previous six sets. The Bryan brothers were to follow, and they had lost just four games in three sets.

But Hantuchova crumpled against Olga Govortsova, an opponent she had beaten just four days earlier, losing 5-0 to put the Aviators into a 17-14 deficit. Then, the Lasers’ duo of Ross Hutchins and Michael Russell broke Mike Bryan’s serve at 1-1 in the fifth set en route to a 5-3 win.